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Initial s390-tools-2.0.0 import

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This commit is based on the s390-tools-1.39.0 version.

Changes on top of s390-tools-1.39.0:

 - Add MIT license to all source files
 - Add LICENSE file
 - Transform REAMDE to README.md (markdown)
 - Add AUTHORS.md file
 - Add CONTRIBUTING.md file
 - Move changelog from README to CHANGELOG.md file

Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
This commit is contained in:
Michael Holzheu
2017-08-07 16:13:17 +02:00
commit b627b8d8e1
647 changed files with 168974 additions and 0 deletions
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138
ipl_tools/system.c Normal file
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/*
* ipl_tools - Linux for System z reipl and shutdown tools
*
* Shared system functions
*
* Copyright IBM Corp. 2008, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#include "ipl_tools.h"
/*
* Check if we are running in an LPAR environment
*/
int is_lpar(void)
{
size_t bytes_read;
char buf[2048];
int rc = 0;
FILE *fh;
fh = fopen("/proc/cpuinfo", "r");
if (fh == NULL)
ERR_EXIT_ERRNO("Could not open \"/proc/cpuinfo\"");
bytes_read = fread(buf, 1, sizeof(buf), fh);
if (bytes_read == 0)
ERR_EXIT("Could not read \"/proc/cpuinfo\"");
buf[bytes_read] = '\0';
if (strstr(buf, "version = FF") == NULL)
rc = 1;
fclose(fh);
return rc;
}
/*
* Check whether we are started as root
*/
int is_root(void)
{
if (geteuid() == 0)
return 1;
else
return 0;
}
/*
* Convert a string to lower case
*/
void strlow(char *s)
{
while (*s) {
*s = tolower(*s);
s++;
}
}
/*
* Read a string from a particular file
*/
void read_str(char *string, const char *path, size_t len)
{
size_t rc;
FILE *fh;
fh = fopen(path, "rb");
if (fh == NULL)
ERR_EXIT_ERRNO("Could not open \"%s\"", path);
rc = fread(string, 1, len - 1, fh);
if (rc == 0 && ferror(fh))
ERR_EXIT_ERRNO("Could not read \"%s\"", path);
fclose(fh);
string[rc] = 0;
if (string[strlen(string) - 1] == '\n')
string[strlen(string) - 1] = 0;
}
/*
* Read a string from a particular /sys/firmware file
*/
void read_fw_str(char *string, const char *file, size_t len)
{
char path[PATH_MAX];
snprintf(path, sizeof(path), "/sys/firmware/%s", file);
return read_str(string, path, len);
}
/*
* Print content of a file (path = dir/file)
*/
void print_fw_str(const char *fmt, const char *dir, const char *file)
{
char path[PATH_MAX], str[4096];
snprintf(path, sizeof(path), "%s/%s", dir, file);
read_fw_str(str, path, sizeof(str));
printf(fmt, str);
}
/*
* Write a string to a file
*/
void write_str(char *string, char *file)
{
char path[PATH_MAX], value[4096];
int fh;
snprintf(value, sizeof(value), "%s\n", string);
snprintf(path, sizeof(path), "/sys/firmware/%s", file);
fh = open(path, O_WRONLY);
if (fh < 0)
ERR_EXIT_ERRNO("Could not open \"%s\"", file);
if (write(fh, value, strlen(value)) < 0)
ERR_EXIT_ERRNO("Could not set \"%s\"", file);
close(fh);
}
/*
* Write a string to a file and return ERRNO
*/
int write_str_errno(char *string, char *file)
{
char path[PATH_MAX], value[4096];
int fh;
snprintf(value, sizeof(value), "%s\n", string);
snprintf(path, sizeof(path), "/sys/firmware/%s", file);
fh = open(path, O_WRONLY);
if (fh < 0)
ERR_EXIT_ERRNO("Could not open \"%s\"", file);
if (write(fh, value, strlen(value)) < 0)
return errno;
close(fh);
return 0;
}